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Unauthorized access to saved passwords in Mozilla Firefox and Firefox ESR

Published: 2019-08-15
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-11733
Exploitation vector Local
Public exploit N/A
Vulnerable software
Firefox ESR
Client/Desktop applications / Web browsers

Mozilla Firefox
Client/Desktop applications / Web browsers

Vendor Mozilla

Security Advisory

This security advisory describes one low risk vulnerability.

1) Unprotected storage of credentials

Severity: Low

CVSSv3: 2.9 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11733

CWE-ID: CWE-256 - Unprotected Storage of Credentials

Exploit availability: No


The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a logical error in the way stored passwords are processed. A local user can access stored passwords in the 'Saved Logins' dialog, as locally stored passwords can be copied to the clipboard thorough the 'copy password' context menu item without first entering the master password.


Install updates from vendor's website.

Vulnerable software versions

Firefox ESR: 60.0, 60.0.1, 60.0.2, 60.1.0, 60.2.0, 60.2.1, 60.2.2, 60.3.0, 60.4.0, 60.5.0, 60.5.1, 60.5.2, 60.6.0, 60.6.1, 60.6.2, 60.6.3, 60.7.0, 60.7.1, 60.7.2, 60.8.0, 68.0, 68.0.1

Mozilla Firefox: 61.0, 61.0.1, 61.0.2, 62.0, 62.0.1, 62.0.2, 62.0.3, 63.0, 63.0.1, 63.0.3, 64.0, 64.0.1, 64.0.2, 65.0, 65.0.1, 65.0.2, 66.0, 66.0.1, 66.0.2, 66.0.3, 66.0.4, 66.0.5, 67.0, 67.0.1, 67.0.2, 67.0.3, 67.0.4, 68.0, 68.0.1

CPE External links

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.